Pump for corrosive fluids.



PATENTED FEB. 18, 1908.

E. MORTERUD. PUMP, FOR GORROSIVE FLUIDS.

APPLIOATION FILED SEPT. 3. 1907.

UNITED? STATES PATENT ornron.

E NAR MORTERUD, or TonDERoD," NEAR Moss, NORWAY.

PUMP FOR CORROSIVE FLUIDS.

Specification of Letters Patent.

Patented Feb. 18, 1908-.

' Application filed September 3. 1907. Serial No. 391116.

' as will enable others skilled in the art to which it appertains to make and use the same, reference bein had to the accomp'anyat the point, where it extends through the box into the pump case to engage the wheel. By the present invention this is avoided in the following manner: The packing box is constructed in such away, that a non-cor rosive fluid is pressed in around the shaft and" out around the same through the shaft hole, in the pump wall and then between the pump wall and the wheel. The necessary pressure maymost suitably be; imparted to the said fluid by putting it into direct pressure connection with the pressure side of the pump by means of which pressure it may be caused to pass around the shaft. If the corrosive fluid is warm, and of such a nature that its corrosive action is not, in cold condition, of any importance, it may be arranged so as to util ize such fluid in cold condition to protect the shaft against the corrosive effect of the warm fluid. 'This is attained simplyby taking out the rotectin fluid fromthe' ressure side of the pump andicooling itin some Way or other, whereupon it is passed inin cold condition to the shaft. V

In theaccompanying drawing, Figure 1 is an axial section of a pump embodying my invention, and Fig. 2 is a similar view showing a modification.

From the pressure chamber A of the pump of the shaft.

a pipe B is assed through a cooling device C to an annu ar chamber D around the shaft. From this latterchamber the cold fluid is pressed inward. against the hub of the Wheel and then mixes w ith the warm fluid.

If a fluid is used which is also corrosive in cold state, a special protecting fluid is made use 'of, for instance water or the pump ing fluid may be used in neutralized-state.-

The protecting fluid may then either be passed in around the shaft by means of a separate pressure source, or it may by pressure from the pressure side of the pum be conducted from a supply tank to the sha t. In Fig. 2 of the drawing is shown means to press water or other neutral fluid into the chamber D. The pipe B is then carried to the bottom of a receiver F, that has, for instance by a pump G, beenfllled with water, before starting the whole apparatus. The pump G may of course either continuously or discontinuously supply the receiver F with water dur ing the operation. Between the water and the inlet of the pipe B may be disposed a piston H. The pressure through the pipe B now causes the water to be pressed in through the pipe B. If an additional rotection of the packing box, and particu arly of the packing material in the same, is desired, the may, as shown in the drawing, be cooled by making it hollow and conducting a stream of water through a circulation passage K made hollow and provided with a pipe I- through which a cooling medium (water) is pressed into the bottom of the boring and is dischargedbetween the pipe and the boring lar space surrounding the shaft near the means for cooling the fluid passing through 10 pump wheel, a conduit connecting the pressaid conduit.

sure side of the pump with said space and In testil'nony that I claim the foregoing as means connected with said conduit for demy invention, I have signed my name in priving the fluid of its corrosive nature. presence of two subscribing Witnesses.

3. In pumps for corrosive fluids an annu- EINAR MORTERUD. lar space surrounding the shaft near the 'VVitnesses: pump'wheel, a conduit connecting the pres HENRY BORDEWICH,

sure side of the pump with said space and MIcH-A'EL ALGER. 

